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Q: Can you tell me how long it would take to replace a 1999 Cadillac Deville alternator

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Have had it tested, definitely the alternator

My car has 117000 miles.
My car has an automatic transmission.

Hello there. The alternator replacement should call for 2.8 hours replacement time. The radiator needs to be removed and the A/C evacuated and recharged. There may be additional part charges for coolant and refrigerant. If you would like to have this service done, a certified technician from YourMechanic can perform an alternator replacement at your home or office.

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